Analysis of Transverse Mechanical Properties of Overlying Concrete Slabs over Steel Girders of Different Cross-Sections
In the steel-concrete composite girder bridge,different types of steel girders result in different transverse stress performances of the overlying concrete slabs.The Tianqiao Bridge of Jiulong East Junction in Shandong Province was used as a case.High-fidelity finite element models of four different types of steel-concrete composite girders were established,including the composite girders with steel I girders and corrugated steel webs,steel box girders with corrugated steel webs,steel I-section plate girders,and concrete box girders.The effects of numbers of loading wheels and locations of wheel loads on the effective breadth width of concrete slabs were compared.The transverse bending moments of the concrete slabs associated with self-weight of concrete,wheel loads and the synergy of the two were analyzed and compared with the calculations given in the Specifications for Design of H ighway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(J TG 3362-2018).The results show that the effective breadth width of concrete slabs under dual-wheel loads is notably bigger than that under single-wheel loads.In the transverse design,the influence of number of acting wheels on the safety of the bridge deck should be considered.To calculate the effective breadth width of concrete slabs of the steel-concrete composite girder,when the wheels act at midspan(along bridge width)and near the supports,the specification J TG 3362-2018 should be referenced,but when the wheels act at supports and cantilevers of the main girder,it is suggested to adopt the correction factors of 0.6 and 1.5,respectively.The suggested bending moment correction factors for the steel I girder with corrugated steel webs,steel box girder with corrugated steel webs and steel I-section plate girder are 0.60,0.60 and 0.65,respectively,and under the synergy of the self-weight and wheel loads,the values should be 0.55,0.55 and 0.60,respectively.
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